I am looking at the PARS archives:
Did search: Tierras
http://www.archivesportaleurope.net/web/guest
And going through the list to see if I can find that kind of info on Nuevo Galicia (Jalisco) or Zacatecas. Seeing all kinds of things.
I came across this one reference number:
PATRONATO,295,N.28
Looking at the first page there is a hand with finger point to the top of the line:
Instruccion a Colon:
Here is another one:
Carta de Cristóbal Colón al papa Alejandro VI informando de sus viajes y solicitándole religiosos para enviarlos a las tierras descubiertas.
1502
Reference number: PATRONATO,295,N.44